Small: See the size comparison chart at
http://www.acme.com/software/thttpd/notes.html#sizes. It also has a
very small run-time size, since it does not fork and is very careful about
memory allocation.

Log message:
thttpd: update to 2.28.
From nia in PR 53266.
New in version 2.28:
Improvements to the FreeBSD startup script. (Craig Leres)
Minor portability tweak in mmc.c.
Fix to buffer overrun bug in htpasswd. Reported by Alessio Santoru as \
CVE-2017-17663.
New in version 2.27:
Stats syslogs changed from LOG_INFO to LOG_NOTICE.
Use memmove() for self-overlapping string copies instead of strcpy().
Couple of subroutine name changes for consistency.

Log message:
Replaced $(ROUND) with ${CURLY} variable references.
This has been a pkglint warning for several years now, and pkglint can even
fix it automatically. And it did for this commit.
Only in lang/mercury, two passes of autofixing were necessary because there
were nested variables.